One of the partygoers sickened by the liquid nitrogen.

A pool party turned into a chemistry experiment gone wrong in Mexico when organizers poured liquid nitrogen into the pool, creating a noxious fog that put one man in a coma and sickened eight others.

The nitrogen formed a thick cloud over the pool and hampered revelers’ breathing, proving almost deadly.

One person is in a coma and eight are hospitalized after a pool party in Mexico goes horribly wrong.

(Liveleak)

The fun-filled day at the Leon party, hosted by drink company Jägermeister, took a turn for the worse after four bottles of nitrogen were poured into the pool, The Mirror reported.

One man was in a coma while others suffered respiratory problems and were hospitalized.

(Cadena3Noticias)

“They realized that I had fainted because they saw the tray floating alone in the pool,” Jael Jimenez, a hostess at the party, told Milenio.com. “Otherwise, I might have drowned.”

The chemical brew created a noxious cloud that made partiers fall ill.

(Liveleak)

Jimenez was one of several who jumped in the pool and fell ill. Many passed out and slipped under the water.

Once bystanders realized those in the pool were ill, they jumped in to save them.

(Liveleak)

Most victims have been treated and released from the hospital. Jose Ignacio Lopez del Toro, 21, remains in intensive care in a coma, Univision Noticias reported.

The pool party in Mexico was sponsored by Jägermeister.

(Liveleak)

Video of the party gone wrong show the moment the fun turned to horror. As the noxious cloud spread, revelers can be heard off-camera coughing and hacking. When partygoers outside the pool realize something has gone wrong, several jump in the water to pull out the unconscious victims.

“I might have drowned,” recounts Jael Jimenez, a hostess at the party.

(Liveleak)

“Ayudame” — or “help me” in English — one man yells as he works to pull a slumped body from the contaminated area.

The organizers put liquid nitrogen in the pool, creating a dangerous substance that could have been fatal.

(Liveleak)

Mexican authorities have begun an investigation and may press charges.

“We are aware of this incident in Leon, Mexico, which is currently being investigated by our headquarters in Germany,” a Jägermeister spokesman told The Mirror. “Fortunately, all of those who required medical attention are out of danger and recovering.”